perf symbols: allow forcing use of cplus_demangle

For Fedora, I want to force perf to link against libiberty.a for
cplus_demangle, rather than libbfd.a for bfd_demangle due to licensing insanity
on binutils. (libiberty is LGPL2, libbfd is GPL3.)

If we just rely on autodetection, we'll end up with libbfd linked against us,
since they're both in binutils-static in the buildroot.

Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20100510204335.GA7565@bombadil.infradead.org>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index b28bb7359b14e9778226e0cce5143658e269f659..0797786aa72a89ea900867cc73239b5a99ca2aad 100644 (file)
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -592,6 +592,9 @@ endif
 
 ifdef NO_DEMANGLE
        BASIC_CFLAGS += -DNO_DEMANGLE
+else ifdef HAVE_CPLUS_DEMANGLE
+       EXTLIBS += -liberty
+       BASIC_CFLAGS += -DHAVE_CPLUS_DEMANGLE
 else
        has_bfd := $(shell sh -c "(echo '\#include <bfd.h>'; echo 'int main(void) { bfd_demangle(0, 0, 0); return 0; }') | $(CC) -x c - $(ALL_CFLAGS) -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) -lbfd "$(QUIET_STDERR)" && echo y")